| 摘 要： | During recent years,it has become increasingly evident that there are obvious differences inthe ultrastructure of arterial smooth muscle cellsbetween fetuses and adults.To further characterize the ultrastructure of arterial smooth cells inhuman fetuses and adults,10 specimens of fetusesand 6 specimens of adults from aorta were collected.Moreover, 4 specimens of atherosclerosisplaques from adult aorta were taken. All thespecimens were processed for electron microscopy.We observed that the smooth muscle cells in fetues showed fibroblast-like appearance with intensive rough endoplasmic reticulum, a prominent
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